Research on Methods of Ascertaining Characteristic Parameter for Small Watershed Soil Erosion

2011 ◽  
Vol 391-392 ◽  
pp. 1315-1318
Author(s):  
Li Jiang ◽  
Di Zhang
Keyword(s):  
Water Quality ◽  
Soil Erosion ◽  
Watershed Management ◽  
Yellow River ◽  
Characteristic Parameter ◽  
Land Productivity ◽  
Small Watershed ◽  
Planning And Design ◽  
Lakes And Reservoirs

Soil erosion always leads to decreasing of land productivity, deposition of channels, lakes and reservoirs, pollution of water quality and so on. In the small watershed management, the soil erosion amount should be definite. The erosion modulus is able to quantitatively characterize the average extent of soil erosion. In practice, it is difficult to ascertain the erosion modulus. Several methods to ascertain erosion modulus are introduced in this article. Taken some small watershed of Yellow River in West Henan region as an example, these methods are testified to be feasible in ascertaining the erosion modulus. In the construction of small watershed dam system projects and planning and design of hydro junctions, methods and thoughts can be provided for the determination of the erosion modulus.

Effect of ecological construction on sediment connectivity in a typical small watershed on Loess Plateau

2021 ◽  
Author(s):  
Yongyong Ma ◽  
Zhanbin Li ◽  
Jingming Hou ◽  
Peng Li ◽  
Zongping Ren ◽  
...  
Keyword(s):  
Soil Erosion ◽  
Loess Plateau ◽  
Yellow River ◽  
The Yellow River ◽  
Small Watershed ◽  
Water And Sediment ◽  
Local Soil ◽  
Sediment Connectivity ◽  
The Mean ◽  
Ecological Construction

<p>In recent years, the significantly decrease of water and sediment in the Yellow River has attracted wide attention from domestic and foreign scholars. The Loess Plateau is the main source of sediment in the Yellow River, which ecological environment changes caused by large-scale ecological construction measures is considered as one of the main factors affecting the water and sediment changes in the Yellow River. In this study, the Wangmaogou small watershed in Loess Plateau was taken as the study area. On the basis of summing up the process of ecological construction in Wangmaogou watershed, and restoring the topography before ecological construction by topographic map, we set up four scenarios of ecological construction to analyzed the characteristics of sediment connectivity under different ecological construction scenarios and the effects of ecological construction on sediment connectivity, which are before ecological construction, only slope measures are built, only channel measures are constructed, and at the same time slope measures and channel measures are constructed. Under the same ecological construction scenario, the index of sediment connectivity (IC) of the basin shows a decreasing trend from ridge to gully, which mean the connectivity of the sediment at the ridge is less than that at the gully, and the gully are more prone to occur soil erosion than ridge. The distributed of large amount of construction land in the middle and lower reaches at the main gully of Wangmaogou small watershed reduces the connectivity of their surrounding sediment, and the region is prone to occur sediment deposition. Eco-construction measures have decreased significantly the sediment connectivity index (p<0.01) of Wangmaogou small watershed, and reduced the occurrence of soil erosion. Laying ecological measures lessened the possibility of local soil erosion, and increased the resistance of sediment in the transport process. Compared with the situation without ecological control, the mean of D<sub>up</sub> index decreased by 75.27% by laying slope and gully measures, while the mean of D<sub>up</sub> index decreased by only 6.45% by laying gully measures.</p>

Preliminary Exploration of Ecological Landscape Construction on Hill and Gully Regions of Loess Plateau

2014 ◽  
Vol 584-586 ◽  
pp. 621-624 ◽  
Author(s):  
Wan Fei Gao ◽  
Man Lin Zhu
Keyword(s):  
Soil Erosion ◽  
Loess Plateau ◽  
Water Loss ◽  
Large Range ◽  
Landscape Planning ◽  
Hydraulic Engineering ◽  
Ecological Environment ◽  
Small Watershed ◽  
Planning And Design ◽  
Ecological Landscape

For the research on hill and gully landscape of Loess Plateau, to prevent water loss and soil erosion and improve the ecological environment, the paper analyzes the construction of ecological landscape from the large range to small, puts focus on small watershed and hilly gully, and chooses Baiyun mountain demonstrate area as a case to present its landscape planning and design. The research and its related activities integrated and coordinated multidisciplinaries, like the hydraulic engineering, civil engineering and other disciplines. The project constructed dams, transferred and stored water in the gully which has better conditions, achieved good results. Due to the characteristics of hill and gully regions of Loess Plateau, its ecological environment construction must be closely combined with other disciplinaries. Moreover, it is better to construct different demonstrate areas to well improve the research on macro ecological environment.

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